It was burning just north of Silverwood Lake, Cal Fire officials said.

"One firefighter was injured after a tree branch fell on him," said U.S. Forest Service spokesman John Miller. "He suffered from minor injuries but as a precautionary measure he was taken to the hospital to be checked out by medical personnel."

Arson investigators were on scene to try to determine the cause of the fire, Miller added.

Strike teams were called in to protect structures in the fire's path in Telephone Canyon but no evacuations were ordered, fire officials said.

Officials said the fire was 30 percent contained at the time of this report.

Firefighters planned to work all night on getting full containment of the fire.